Airbag control unit with part number UR81-57K30

What does the airbag control unit UR81-57K30 do?

The control unit UR81-57K30 is the central control unit of the restraint system (SRS) for Ford. It evaluates the signals from the crash sensors and decides within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered.

At the same time it monitors the entire system continuously. If it detects a fault, it displays this via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself.

Why does the control unit UR81-57K30 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase this data. Further causes lie in the electronics themselves or in the power supply.

Crash data remains in the unit's memory until it is specifically dealt with. That is why the fault memory should be looked at first, before other causes are considered.

In detail, these causes come into consideration:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the UR81-57K30 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which is lit permanently or intermittently. Fault messages in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared are also signs.

Typical signs at a glance:

• Airbag warning light permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to trigger. Therefore have the fault checked promptly.

Which vehicles is the UR81-57K30 fitted in?

The UR81-57K30 is fitted in these vehicles: Ford Ranger 2 (2007-2009) and 2 Facelift (2009-2011).

We list the following vehicles for this part number:

• Ford Ranger 2 (2007-2009)
• Ford Ranger 2 Facelift (2009-2011)

Matching the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory, which you have read out beforehand.

How does the repair of the UR81-57K30 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next you create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit goes back to you.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit UR81-57K30 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shock-proof.